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    <title>高级函数调用追踪器</title>
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            box-sizing: border-box;
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        .log-area p {
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        .log-area p span {
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        .code-snippet {
            margin-top: 30px;
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            color: #eceff1; /* 浅色文字 */
            border-radius: 10px;
            padding: 20px;
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            font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
            font-size: 0.9em;
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        .code-snippet pre {
            margin: 0;
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        .code-snippet code {
            display: block;
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        .code-snippet .comment {
            color: #90a4ae; /* 灰色注释 */
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        .code-snippet .keyword {
            color: #80cbc4; /* 浅青色关键字 */
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        .code-snippet .string {
            color: #c5e1a5; /* 浅绿色字符串 */
        }

        .code-snippet .function-name {
            color: #ffcc80; /* 橙色函数名 */
        }

        .code-snippet .variable {
            color: #e6ee9c; /* 浅黄色变量 */
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>高级函数调用追踪器</h1>
        <p class="info-text">
            本工具演示了如何使用 <code>functionName</code> 辅助函数来透明地追踪JavaScript函数的调用。
            每次点击按钮，相关业务逻辑函数被执行时，其名称和执行信息都会被记录到下方日志区域，
            同时控制台也会输出详细的调试信息。这对于理解程序流程、调试和性能分析非常有帮助。
        </p>

        <div class="button-group">
            <button id="userLoginBtn">用户登录</button>
            <button id="productViewBtn">查看商品详情</button>
            <button id="addToCartBtn">添加商品到购物车</button>
            <button id="checkoutBtn">完成订单结算</button>
            <button id="adminReportBtn">生成系统报告</button>
            <button id="dataExportBtn">导出用户数据</button>
        </div>

        <div class="log-area-wrapper">
            <div class="log-area" id="logArea">
                <p><strong>系统日志:</strong> <span>应用已启动，等待操作...</span></p>
            </div>
        </div>

        <div class="code-snippet">
            <p><code>functionName</code> 核心代码片段:</p>
            <pre><code>
<span class="keyword">const</span> <span class="function-name">functionName</span> = <span class="variable">handler</span> => {
    <span class="keyword">const</span> <span class="variable">name</span> = <span class="variable">handler</span>.<span class="variable">name</span> || <span class="string">'anonymousFunction'</span>;
    <span class="comment">// 在控制台输出调试信息</span>
    <span class="variable">console</span>.<span class="function-name">debug</span>(<span class="string">`[DEBUG] 调用函数: ${name}`</span>);
    <span class="comment">// 记录到页面日志区域</span>
    <span class="function-name">logToArea</span>(<span class="string">`[LOG] 函数 '${name}' 被调用。`</span>);
    <span class="keyword">return</span> <span class="variable">handler</span>;
};
            </code></pre>
        </div>
    </div>

    <script>
        // 核心函数：用于获取函数名称并执行函数
        const functionName = handler => {
            const name = handler.name || 'anonymousFunction';
            console.debug(`[DEBUG] 调用函数: ${name}`);
            logToArea(`函数 '${name}' 被调用。`);
            return handler;
        };

        // 日志输出到页面
        const logArea = document.getElementById('logArea');
        function logToArea(message) {
            const p = document.createElement('p');
            const timeSpan = document.createElement('strong');
            timeSpan.textContent = `${new Date().toLocaleTimeString()}:`;
            const msgSpan = document.createElement('span');
            msgSpan.textContent = message;
            p.appendChild(timeSpan);
            p.appendChild(msgSpan);
            logArea.appendChild(p);
            logArea.scrollTop = logArea.scrollHeight; // 滚动到底部
        }

        // 业务逻辑函数
        const handleUserLogin = () => {
            // 模拟登录操作，可能涉及异步请求
            logToArea('用户登录流程启动...');
            return new Promise(resolve => setTimeout(() => {
                console.log('用户登录成功！');
                logToArea('用户登录成功！');
                resolve();
            }, 800));
        };

        const handleProductView = (productId) => {
            // 模拟查看商品操作，带参数
            logToArea(`正在查看商品 ID: ${productId}...`);
            return new Promise(resolve => setTimeout(() => {
                console.log(`商品 ID ${productId} 详情已加载。`);
                logToArea(`商品 ID ${productId} 详情已加载。`);
                resolve();
            }, 500));
        };

        const handleAddToCart = (item, quantity) => {
            // 模拟加入购物车操作，带多个参数
            logToArea(`尝试添加 ${quantity} 个 ${item} 到购物车...`);
            return new Promise(resolve => setTimeout(() => {
                if (Math.random() > 0.2) { // 80% 成功率
                    console.log(`成功添加 ${quantity} 个 ${item} 到购物车。`);
                    logToArea(`成功添加 ${quantity} 个 ${item} 到购物车。`);
                } else {
                    console.error(`添加 ${item} 到购物车失败！`);
                    logToArea(`添加 ${item} 到购物车失败！`);
                }
                resolve();
            }, 700));
        };

        const handleCheckout = () => {
            // 模拟结算操作，可能涉及复杂流程
            logToArea('结算流程启动...');
            return new Promise(resolve => setTimeout(() => {
                console.log('订单已提交，等待支付。');
                logToArea('订单已提交，等待支付。');
                resolve();
            }, 1200));
        };

        const generateAdminReport = () => {
            // 模拟生成报告操作，耗时较长
            logToArea('正在生成管理报告，请稍候...');
            return new Promise(resolve => setTimeout(() => {
                console.log('管理报告生成完毕。');
                logToArea('管理报告生成完毕。');
                resolve();
            }, 2000));
        };

        const handleDataExport = (format = 'CSV') => {
            // 模拟数据导出，带默认参数
            logToArea(`正在导出用户数据为 ${format} 格式...`);
            return new Promise(resolve => setTimeout(() => {
                console.log(`用户数据已成功导出为 ${format} 格式。`);
                logToArea(`用户数据已成功导出为 ${format} 格式。`);
                resolve();
            }, 1500));
        };

        // 绑定事件监听器，使用 functionName 包装业务逻辑函数
        document.getElementById('userLoginBtn').addEventListener('click', () => functionName(handleUserLogin)());
        document.getElementById('productViewBtn').addEventListener('click', () => functionName(handleProductView)(101));
        document.getElementById('addToCartBtn').addEventListener('click', () => functionName(handleAddToCart)('Wireless Mouse', 2));
        document.getElementById('checkoutBtn').addEventListener('click', () => functionName(handleCheckout)());
        document.getElementById('adminReportBtn').addEventListener('click', () => functionName(generateAdminReport)());
        document.getElementById('dataExportBtn').addEventListener('click', () => functionName(handleDataExport)('JSON'));

        // 初始提示
        logToArea('应用已加载，请点击按钮进行操作。');
    </script>
</body>

</html>